MerCruiser 4.3L Carbureted Engine with Alpha Sterndrive 300 Hour Maintenance Kit

Mercury Marine MerCruiser 4.3L Carbureted Engine with Alpha Sterndrive 300 Hour Maintenance Kit

The Mercury Precision Parts 300 Hour Maintenance Kit (part number 8M0147063) contains everything needed to complete a factory-spec 300-hour service on MerCruiser 4.3L carbureted engines made by General Motors with the oil filter mounted directly to the engine block and Alpha sterndrive systems from 1996 and newer. Packaged as a single convenient kit, it eliminates the need to source individual components and ensures every part meets OEM engineering tolerances.

Mercury designs these kits around the exact specifications of each engine family, meaning every seal, filter, and belt is built to the tolerances your engine was engineered for. OEM parts deliver better reliability, proper fit, and long-term protection compared to aftermarket substitutions, which rarely match the same quality standards — especially when exposed to saltwater or high-hour use.

Key Features

• Complete 300-hour service kit for MerCruiser 4.3L carbureted engines made by General Motors
• Fits engines with oil filter mounted directly to the engine block and Alpha sterndrive systems (1996 and newer)
• Includes oil filter, fuel filter, gearcase drain seals, spark plugs, thermostat, thermostat gasket, and serpentine belt
• High-pleat oil and fuel filters capture fine debris for cleaner lubrication and fuel delivery
• Heavy-duty electroplated filter housings resist corrosion in harsh marine environments
• Fresh spark plugs restore crisp starts and smooth acceleration
• Thermostat and gasket ensure stable temperature control to prevent performance degradation over time
• Serpentine belt replacement removes wobble, slip, or squeal that develops after extended use
• Gearcase drain seals protect the sterndrive from water intrusion, a leading cause of gear longevity issues
• Compatible with both freshwater and saltwater environments
• Suitable for bowriders, cuddy cabins, runabouts, ski boats, and light cruisers in recreational and light commercial applications
• Complete your service with genuine Mercury 4-Stroke Marine Engine Oil and Mercury Premium Gear Lube 858058K01 (sold separately)
• Backed by decades of Mercury engineering, testing, and manufacturing expertise